Black Sabbath fans in Edmonton and Calgary will have to wait for their fix of the British rock band as a medical emergency suffered by lead singer Ozzy Osbourne has caused the band to postpone Saturday night's show at Rexall Place and Monday night’s show at the Scotiabank Saddledome.

The band announced the postponement on their Twitter and Facebook pages.

Due to extreme sinusitis with Ozzy Osbourne the shows in both Edmonton and Calgary have been postponed. Details... https://t.co/b59XeaNgdL